लॉकर में न तो तौलिया है, न ही पानी की बोतल।

It means neither ... nor ....

So:

• न तो तौलिया है = there is no towel
• न ही पानी की बोतल = nor is there a water bottle

Together, the sentence means There is neither a towel nor a water bottle in the locker.

A very common pattern is:

• न तो X, न ही Y
• neither X nor Y

You may also see the shorter version न X, न Y, especially in simpler or more informal sentences.

में means in / inside.

So:

• लॉकर = locker
• लॉकर में = in the locker

Hindi uses postpositions, not prepositions. That means the word like in comes after the noun, not before it.

Compare:

• English: in the locker
• Hindi: locker in → लॉकर में

Hindi often puts the location first, then the things being talked about.

So the structure here is roughly:

• लॉकर में = in the locker
• न तो तौलिया है = there is no towel
• न ही पानी की बोतल = nor a water bottle

A natural English translation starts with There is..., but Hindi does not need a separate word for there is in the same way. The verb है simply shows existence/presence in context.

So Hindi prefers something like:

• In the locker, there is neither a towel nor a water bottle.

Good question. Here, Hindi is treating the sentence as two linked negative clauses:

• न तो तौलिया है
• न ही पानी की बोतल [है]

The second है is understood and left out because it is easy to guess.

So the sentence is really functioning like:

• There is no towel, nor is there a water bottle.

Because each item is being denied separately, singular है is natural here.

You could think of it as:

• तौलिया है = a towel is there
• पानी की बोतल है = a water bottle is there

Both are singular, so है makes sense.

ही adds emphasis.

In this sentence, न ही makes the second negative item feel more strongly connected to the first one. It helps produce the full neither ... nor ... effect.

So:

• न तो ... न ही ... = a polished, standard way to say neither ... nor ...

Without ही, the sentence could still make sense in many contexts, but न ही sounds more complete and idiomatic here.

Yes, that is possible and understandable.

Hindi has several ways to express this idea:

• लॉकर में न तो tौलिया है, न ही पानी की बोतल।
• लॉकर में न तौलिया है, न पानी की बोतल।

The version with न तो ... न ही ... sounds a bit more formal, balanced, and explicit.

The shorter न ... न ... is also common and natural.

Because बोतल is a feminine noun.

In Hindi, when one noun describes another with का / की / के, that linking word agrees with the second noun, the possessed item.

Here:

• पानी = water
• बोतल = bottle
• पानी की बोतल = bottle of water / water bottle

Since बोतल is feminine, Hindi uses की.

Compare:

• पानी का गिलास = a glass of water
  because गिलास is masculine
• पानी की बोतल = a bottle of water
  because बोतल is feminine

Yes, literally it is something like the bottle of water or water’s bottle, but in natural English we usually say water bottle or bottle of water.

Hindi often uses this possessive-style construction where English might use a noun directly as an adjective.

So:

• पानी की बोतल = bottle of water / water bottle
• चाय का कप = cup of tea
• दूध का गिलास = glass of milk

Hindi usually does not use articles like a, an, and the the way English does.

So:

• तौलिया can mean a towel or the towel
• पानी की बोतल can mean a water bottle or the water bottle

The exact meaning depends on context.

In this sentence, English naturally uses a towel and a water bottle, but Hindi does not need separate article words for that.

• तौलिया is generally masculine
• बोतल is feminine

This matters for agreement in Hindi when adjectives or other agreeing words are involved.

In this sentence, the most visible gender clue is:

• पानी की बोतल
  where की shows agreement with feminine बोतल

It is a loanword from English locker.

Hindi uses many borrowed words, especially for modern objects. In Devanagari it is written as:

• लॉकर

The ॉ sound shows the aw/o-type vowel used to represent the English pronunciation more closely.

So this is very normal Hindi, even though the noun originally came from English.

A more fully spelled-out version would be:

• लॉकर में न तो तौलिया है, न ही पानी की बोतल है।

The final है is often omitted because it is understood from the first clause.

Hindi frequently leaves out repeated words when the meaning is clear.

So both are fine, but the shorter original sentence is smoother and more natural.

Yes. Another natural way is:

• लॉकर में तौलिया भी नहीं है और पानी की बोतल भी नहीं है।

This means something like:

• There isn’t a towel either, and there isn’t a water bottle either.

It is correct, but it has a slightly different feel.

• न तो ... न ही ... is a neat, compact neither ... nor ... structure.
• भी नहीं is often used when emphasizing also not / not either.

So the original sentence is the most direct match for neither ... nor ....

A helpful rough breakdown is:

• तौ = tau
• लि = li
• या = yaa

So approximately: tau-li-yaa

The तौ part rhymes roughly with the tow in English towel, which may help you remember it, though the pronunciation is not exactly the same as English.

Yes. In meaning, those are basically the same here.

The Hindi structure न तो ... न ही ... most directly matches neither ... nor, but in natural English you could also translate it as:

• There is no towel and no water bottle in the locker.
• The locker has neither a towel nor a water bottle.

All of these communicate the same basic idea.